Improvement in casting copper tubes



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Casting Copper Tubes.

Patented March 26,1872

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JAMES F. GUTHRIE, CF SOUTH BRIDGEWATER, MASSACHUSETTS.

IMPROVEMENT IN CASTING COPPER TUBES.

Speoicationforming part of Letters Patent No. 125,044, dated March 26, 1872.

i employed. Practice, however, has shown that the use of' a rotary mold did not produce uniform or perfect castings 5 that its length and weight, audits revolution at a very high speed prevented thataccuracy of' rotation which is essential f'or a perfect introduction of the molten copper. i v

The purpose of' this invention is to obriate the disadvantages existing in the use of the Letters Patent aforesaid-or in other wordsof a rotary mold, while securing all the advantages which a rotary mold possesses over a stationary one as employed previous to and since said Letters Patent to Freeborn Adams.

The invention consists of' an upright mold in combination with a chamber or vessel, into which the molten metal is poured, that has one, two, or more tubes for distributing the molten metal within the mold, andis arranged to be rotated; its axis of revolution and the axis of the mold being in the same vertical line and plane. By this combination, a conveyance and introduction of the molten meta-l to the mold is secured, without injury or disturbance to the core of' the mold or the mold itself', and with the utmost accuracy and most uniform and perfect results, as practice and use has demonstrated.

In thc accompanying drawing the present improvement in casing copper tubes, cylinders, &c., is illustrated- Figure 1 being a side View of a. mold and chamber with distributing tubes or pipes. Fig. 2, a central vertical longitudinal section; and Fig. 3, ac plan view. i

A in the drawing, represents a moldcase, having a central core, B, with an equal and uniform space, C, around it. This mold Awith the core Bis fixed in an upright position upon a base-plate, D, and the mold A at its lower end is closed, but open at its upper end where a receptacle, H, s0 as to be free to turn. This receptacle H has a horizontal bevel-gear wheel, I, surrounding' it, with which wheel meshes a smaller bevelgear wheel, J, attached to a hori zontal shaft, K, arranged to turn in bearings of posts L of arm G, and to be driven through a winch-handle, M. The receptacle H at its bottom side has two pipes, N, diametrically opposite to each other, which pipes communicate with the interior of receptacle, and ex tend below the arm G in a plane, that, as the receptacle revolves, they will describe a circle about the axis or core of' the mold-case A-this circle being within the scope or circumference of the enlarged mouth E to mold-case A.

With arrangement of parts, such as above described, the molten metal is cast within the mold-case A about its core B, by pouring the molten metal into t-he receptacle H, to which a rotary movement is given by the driving mechanism described, from which receptacle it is distributed and conducted into the 1noldcase A through the pipes N thereto. By providing more than one distributing-pipe N for the molten metal into moldease A, the speed may be reduced at which the distributing-re eeptacle is to revolve, for with two or more pipes the molten metal is delivered as it were in an almost continuous stream relative to any part or point ofthe mold-case, and sufficienti y quick, with a comparatively slow revolution 0f the receptacle, to overcome the possibility of the metal delivered by the onet-ube-becoming so cooled as to prevent the requisite union and evenness in texture or character of the metal tube, &c., being obtained, and the formation of lines, or seams, or air-holes. By distributing the metal through the medium of a revolving` receptacle o'r hopper, H, leaving the mold stationary, no disturbance ot` the molten metal as it settles within the mold-case is occasioned, which, with a revolving mold would occur, more especially if revolved with any degree of speed. In lieu of tWo distributing-pipes for the revolving molten-metal receptacle or hopper H, only one or more than one may be used, but two are preferable, und are found sufficient to secure zt most perfect casting of tubes, 85e., from molten meta-l. The arrangement and construction of parts embraced herein, although pnrticul er1 y described in connection'with casting copper tubes, cylinders, 85o., may be employed for casting tubes, &c., from other molten metals.

H ming thus described my improvement in casting copper tubes, Svc., I shall -state my claims as follows:

`W'hiit I claim as my invention, and desire to secure by Letters Patent, is-

1. A mold-cese, in combination with a revolving distributing chamber or hopper for conducting the molten metal to the mold, substantially as and for the purpose described.

2. The revolving distributin g-hopper for conducting the molten metal to the mold, when provided with two or more distributing-tubes, substantially as described, for the purpose speciiicd.

Vitnesses: JAMES F. GUTHRIE.

ISAAC DAMoN, H. D. SANFORD. 

